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Unformatted text preview: the two are different with commercial A being higher. Is there any difference between the recall proportions for the two commercials. If so, what is the difference? Ho: p 1 p 2 = D =0 Ha: p 1 p 2 <> D =0 (pbar 1 pbar 2 ), the difference found in the two sample proportions Because when Ho is true (p 1 = p 2 ) and the sample sizes are large (n*p & n*(1p) for both >=5) this test stat is NORMAL with mean (pbar1  pbar2) = D = 0 (the difference stated in Ho). = [ pbar 1 *(1pbar 1 )/n 1 + pbar 2 *(1pbar 2 )/n 2 ]^.5 Reject Ho if (pbar 1 pbar 2 ) < "value of the normal distribution with cum prob = .025" or if (phat 1 phat 2 ) > "value of the normal distribution with cum prob = .975"...
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 Spring '07
 Dunne

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